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Class 6 Science Properties of Material Objects can be distinguished based on their characteristics, such as their shapes, qualities, and materials. Studies are more convenient when things are grouped based on their characteristics. It may be categorised according to similarities or differences. The following are typical characteristics that are used to group the objects: 1) Lustre - Materials can be categorised according to how shiny or dull they are. Materials with lustre are shiny, while those without lustre are drab. For instance, shiny materials include things like gold, silver, etc., while non-shiny materials include things like wood, plastic, etc. 2) Hardness/Softness - Materials that are soft are more likely to be crushed or scratched. Cotton is a prime example. Hard materials like iron are among those that are difficult to compress. 3 Transparency a) Transparent materials, or those that totally let the passage of light You can look right through them like glass. b) Opaque mater